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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I was wondering too, but then understood. This is simple school division like column division).
On the example of 21, we putting two 0 to make 100/21 getting 0.0 as a result.
Dividing getting 4 as result (0.04 total) and 16 as remainder.
So we moving one digit right and repeating with 160 getting 0.047 and 13 as a remainder.
Resulting, if we get 1 as a remainder that means that we will repeat the same division process and get same cycled number.
I'm ashamed that I forget the basics...
Most clean and readable solution in my opinion.